System and method of monitoring a load condition of a vehicle

Abstract

A system and method for indicating the load condition of a vehicle having suspension components comprising: at least one of an inclinometer or an accelerometer mounted on at least one suspension component to measure the deflection angle of the suspension component; and a controller configured to use deflection angle and generate an output representative of the load condition of the vehicle.

What is claimed is: 
     
       1. A system for indicating a weight of payload of a vehicle having suspension components, the system comprising:
 a static gravity-sensing accelerometer mounted on at least one suspension component of a suspension assembly, positioned between a vehicle chassis and a wheel hub, and configured as an inclinometer to measure a deflection angle of the at least one suspension component; 
 a controller configured to generate an output signal representative of the weight of payload of the vehicle, wherein the controller uses based upon a comparison of the measured deflection angle of the at least one suspension component to generate the output signal a predetermined threshold and generate the output signal when the measured deflection angle reaches the predetermined threshold; and 
 a sensory output device which indicates the weight of payload of the vehicle in response to the output signal of the controller; wherein the controller is configured to compare the measured deflection angle of the at least one suspension component to a predetermined threshold and generate the output signal when the measured deflection angle reaches the predetermined threshold. 
 
     
     
       2. The system as claimed in  claim 1 , further comprising:
 at least one reference device adapted to generate a reference signal relating to the attitude of the vehicle, wherein the controller is further configured to receive the reference signal and adapt the output signal representative of the load condition to account for a variance in the measured deflection angle of the suspension component created by the attitude of the vehicle. 
 
     
     
       3. The system as claimed in  claim 1 , wherein the sensory output device comprises a display configured to show the load condition of the vehicle. 
     
     
       4. The system as claimed in  claim 1 , wherein the sensory output device comprises a flashing strobe light, a siren, or a buzzer. 
     
     
       5. The system as claimed in  claim 1 , wherein the at least one of an inclinometer or an accelerometer comprises a wireless signal transmitter and wherein the controller comprises an associated wireless signal receiver such that the at least one of an inclinometer or an accelerometer and the controller may communicate with each other over a wireless channel. 
     
     
       6. A method of monitoring the weight of payload of a vehicle having suspension components, the method comprising:
 monitoring a suspension assembly by determining a deflection angle of at least one suspension component of the suspension assembly, positioned between a vehicle chassis and a wheel hub, using a static gravity-sensing accelerometer this is configured as an inclinometer and mounted on the at least one suspension component and configured as an inclinometer; 
 comparing the deflection angle of the at least one suspension component to a predetermined threshold; 
 generating an output signal which is representative of the weight of payload of the vehicle when the deflection angle reaches the predetermined threshold; and 
 using the output signal to activate a sensory output device which indicates the weight of payload of the vehicle. 
 
     
     
       7. The method as claimed in  claim 6 , wherein the sensory output device shows the load condition of the vehicle on a display. 
     
     
       8. The method as claimed in  claim 6 , wherein the sensory output device displays or sounds at least one of an overload warning or a near overload warning. 
     
     
       9. The method as claimed in  claim 6 , further comprising:
 monitoring the deflection angle of the at least one suspension component at two separate time intervals; 
 determining the difference of the deflection angles from the two separate time intervals; and 
 generating a disturbance signal indicating that motion is detected if the difference is greater than a predetermined amount. 
 
     
     
       10. The method as claimed in  claim 6 , further comprising:
 sampling the monitored deflection angle at discrete intervals and storing the sampled data as n sample sets each comprising a number of samples, where n is an integer; and 
 generating a disturbance signal indicating that motion is detected if the difference between two successive sample sets is greater than a predetermined value. 
 
     
     
       11. A method of monitoring the weight of payload of a vehicle having suspension components, the method comprising:
 monitoring a suspension assembly by determining a deflection angle of at least one suspension component of the suspension assembly, positioned between a vehicle chassis and a wheel hub, using a static gravity-sensing accelerometer mounted on the at least one suspension component and configured as inclinometer; 
 comparing the monitored deflection angle to a predetermined threshold; and 
 activating a sensory output device when the monitored deflection angle reaches the predetermined threshold. 
 
     
     
       12. The method as claimed in  claim 11 , wherein the sensory output device indicates the load condition of the vehicle. 
     
     
       13. The method as claimed in  claim 11 , wherein the sensory output device shows the load condition of the vehicle on a display. 
     
     
       14. The method as claimed in  claim 11 , wherein the sensory output device displays or sounds at least one of an overload warning or a near overload warning. 
     
     
       15. The method of claim 11, wherein the vehicle is a commercial vehicle. 
     
     
       16. The method of claim 11, wherein the at least one suspension component is selected from the group consisting of a strut, a leaf spring, a trailing arm, and a short arm. 
     
     
       17. The system of claim 1, wherein the vehicle is a commercial vehicle. 
     
     
       18. The system of claim 1, wherein the at least one suspension component is selected from the group consisting of a strut, a leaf spring, a trailing arm, and a short arm. 
     
     
       19. The method of claim 6, wherein the vehicle is a commercial vehicle. 
     
     
       20. The method of claim 6, wherein the at least one suspension component is selected from the group consisting of a strut, a leaf spring, a trailing arm, and a short arm. 
     
     
       21. A system for indicating a weight of payload of a vehicle, the system comprising:
 a suspension assembly;   a static gravity-sensing accelerometer mounted on at least one suspension component of the suspension assembly, positioned between a vehicle chassis and a wheel hub, and configured as an inclinometer to measure a deflection angle of the at least one suspension component;   a controller configured to generate an output signal based upon a comparison of the measured deflection angle of the at least one suspension component to a predetermined threshold and generate the output signal when the measured deflection angle reaches the predetermined threshold; and   a sensory output device which indicates the weight of payload of the vehicle in response to the output signal of the controller.   
     
     
       22. A system for indicating a weight of payload of a vehicle, the system comprising:
 a vehicle suspension assembly;   a static gravity-sensing accelerometer, mounted on the vehicle suspension assembly in a position between a vehicle chassis and a vehicle wheel hub, that functions as an inclinometer to measure a deflection angle of at least one suspension component of the suspension assembly;   a controller that generates an output signal when the measured deflection angle of the at least one suspension component reaches a predetermined threshold; and   a sensory output device that indicates the weight of payload of the vehicle in response to the controller's output signal.